Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Diego Andres Castellon, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1306331665

Diego Andres Castellon, MD is an Internal Medicine in San Angelo, Texas. Qualified in 2017, 9 years ago. Practices with Shannon Clinic, a 547-clinician group and accepts Medicare assignment. Licensed in New York and Texas.

Years since qualifying
9
Licensed in
NY, TX
In the registry since
2018
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

120 E Harris Ave
San Angelo, TX 76903-5904
Phone: (325) 747-6741
Fax: (325) 747-8377
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Infectious Disease Physician (primary) Taxonomy 207RI0200X · Licence 326673 (NY)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X
Internal Medicine Physician Taxonomy 207R00000X · Licence V4891 (TX)

Record details

NPI number1306331665
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 28, 2018
Last updated in NPPESJune 30, 2025
Certification dateJune 30, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Shannon Clinic — 547 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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